The ability to change the behaviour of a piece of code which is based on certain information in the environment is known as conditional code flow. The conditional logic in Python is primarily based on the “if … else” structure.

 

If Statement

If statement is used to test a condition, if condition is true then the code inside the if statement is executed otherwise that code is not executed.

Syntax 

if condition :

statement

e.g.

i=1

if i==1:

print  "Hello intellipaat"

Output –

Hello intellipaat

 

If Else

If Else is also used to test a condition, if condition is true then the code inside the if statement is executed otherwise else part is executed.

Syntax 

If condition:

statements

else:

statements

e.g.

i=1

if i==2:

print  "Hello intellipaat"

else:

print “Hello”

Output

Hello

 

Nested If

It contains multiple if else condition. It is used to check the multiple conditions. This statement is like executing a if statement inside a else statement.

Syntax

if condition1:

statement

if condition2:

statement

elif condition3:

statement

else

statement

else

statement

e.g. 

 i = 1

if i < 3:

print "i is less than 3"

if i == 2:

print "value of I is equal to 2"

else:

print "value is not equal to 2"

else:

print "Not find true expression"

Output

i is less than 3

value is not equal to 2

 

Python break

It is a jump statement which is used to transfer the control to the end of loop.

e.g.

for i in [10,20,30,40]:

if i==30:

print "Item Found"

break

print i

Output 

10

20

Item Found

 

Python Continue Statement –

It is also a jump statement which is used to skip the current statement and forces to execute next iteration.

 

e.g.

for i in [10,20,30,40]:

if i==30:

print "Item Found"

continue

print i

Output 

10

20

Item Found

40

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